Minor editorial changes to native capabilities section. (#364)

Author: cynthia

index.bs

@@ -2462,7 +2462,7 @@ they may need to for web compatibility reasons.
 
 <h3 id="usecase-oriented-apis">Design based on user needs, not the underlying API or hardware</h3>
 
-Design new native capabilities being brought to the web based on user needs.
+Expose new native capabilities being brought to the web based on user needs.
 
 Avoid directly translating an existing native API to the web.